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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.qi.reference.stream.stream"></a><a class="link" href="stream.html" title="Stream Parsers (stream, wstream, etc.)">Stream Parsers
          (<code class="computeroutput"><span class="identifier">stream</span></code>, <code class="computeroutput"><span class="identifier">wstream</span></code>, etc.)</a>
</h5></div></div></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h0"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.description"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.description">Description</a>
          </h6>
<p>
            The <code class="computeroutput"><span class="identifier">stream_parser</span></code> is
            a primitive which allows to use pre-existing standard streaming operators
            for input parsing integrated with <span class="emphasis"><em>Spirit.Qi</em></span>. It
            provides a wrapper parser dispatching the underlying input stream to
            the stream operator of the corresponding attribute type to be parsed.
            Any value <code class="computeroutput"><span class="identifier">a</span></code> to be parsed
            using the <code class="computeroutput"><span class="identifier">stream_parser</span></code>
            will result in invoking the standard streaming operator for its type
            <code class="computeroutput"><span class="identifier">A</span></code>, for instance:
          </p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">&gt;&gt;</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;,</span> <span class="identifier">A</span><span class="special">&amp;);</span>
</pre>
<h6>
<a name="spirit.qi.reference.stream.stream.h1"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.header"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.header">Header</a>
          </h6>
<pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/qi/stream.hpp&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_stream</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
            Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>.
          </p>
<h6>
<a name="spirit.qi.reference.stream.stream.h2"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.namespace"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.namespace">Namespace</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                    <p>
                      Name
                    </p>
                  </th></tr></thead>
<tbody>
<tr><td>
                    <p>
                      <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">stream</span> <span class="comment">//
                      alias: boost::spirit::qi::stream</span></code>
                    </p>
                  </td></tr>
<tr><td>
                    <p>
                      <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">wstream</span> <span class="comment">//
                      alias: boost::spirit::qi::wstream</span></code>
                    </p>
                  </td></tr>
</tbody>
</table></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h3"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.synopsis"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.synopsis">Synopsis</a>
          </h6>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attrib</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">stream_parser</span><span class="special">;</span>
</pre>
<h6>
<a name="spirit.qi.reference.stream.stream.h4"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.template_parameters"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.template_parameters">Template
            parameters</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Parameter
                    </p>
                  </th>
<th>
                    <p>
                      Description
                    </p>
                  </th>
<th>
                    <p>
                      Default
                    </p>
                  </th>
</tr></thead>
<tbody>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">Char</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      The character type to use to generate the input. This type
                      will be used while assigning the generated characters to the
                      underlying input iterator.
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="keyword">char</span></code>
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">Attrib</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      The type of the attribute the <code class="computeroutput"><span class="identifier">stream_parser</span></code>
                      is expected to parse its input into.
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">basic_hold_any</span><span class="special">&lt;</span><span class="identifier">Char</span><span class="special">&gt;</span></code>
                    </p>
                  </td>
</tr>
</tbody>
</table></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h5"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.model_of"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.model_of">Model
            of</a>
          </h6>
<div class="blockquote"><blockquote class="blockquote"><p>
              <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>
            </p></blockquote></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt>
<dd><p>
                  A variable instance of any type with a defined matching streaming
                  <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code>
                  or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
                  Argument</a> that evaluates to any type with a defined matching
                  streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code>.
                </p></dd>
</dl>
</div>
<h6>
<a name="spirit.qi.reference.stream.stream.h6"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.expression_semantics"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.expression_semantics">Expression
            Semantics</a>
          </h6>
<p>
            Semantics of an expression is defined only where it differs from, or
            is not defined in <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>.
          </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Expression
                    </p>
                  </th>
<th>
                    <p>
                      Description
                    </p>
                  </th>
</tr></thead>
<tbody>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">stream</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code> for the type of the
                      mandatory attribute. The input recognized by this operator
                      will be the result of the <code class="computeroutput"><span class="identifier">stream</span></code>
                      parser. This parser never fails (unless the underlying input
                      stream reports an error). The character type of the I/O istream
                      is assumed to be <code class="computeroutput"><span class="keyword">char</span></code>.
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">wstream</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code> for the type of the
                      mandatory attribute. The input recognized by this operator
                      will be the result of the <code class="computeroutput"><span class="identifier">wstream</span></code>
                      parser. This parser never fails (unless the underlying input
                      stream reports an error). The character type of the I/O istream
                      is assumed to be <code class="computeroutput"><span class="keyword">wchar_t</span></code>.
                    </p>
                  </td>
</tr>
</tbody>
</table></div>
<p>
            All parsers listed in the table above are predefined specializations
            of the <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special">&lt;</span><span class="identifier">Char</span><span class="special">&gt;</span></code> basic stream parser type described
            below. It is possible to directly use this type to create stream parsers
            using an arbitrary underlying character type.
          </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Expression
                    </p>
                  </th>
<th>
                    <p>
                      Semantics
                    </p>
                  </th>
</tr></thead>
<tbody><tr>
<td>
                    <p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">stream_parser</span><span class="special">&lt;</span>
    <span class="identifier">Char</span><span class="special">,</span> <span class="identifier">Attrib</span>
<span class="special">&gt;()</span></pre>
<p>
                    </p>
                  </td>
<td>
                    <p>
                      Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code> for the type of the
                      optional attribute, <code class="computeroutput"><span class="identifier">Attrib</span></code>.
                      The input recognized by this operator will be the result of
                      the <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special">&lt;&gt;</span></code> parser. This parser
                      never fails (unless the underlying input stream reports an
                      error). The character type of the I/O istream is assumed to
                      be <code class="computeroutput"><span class="identifier">Char</span></code>
                    </p>
                  </td>
</tr></tbody>
</table></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h7"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.additional_requirements"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.additional_requirements">Additional
            Requirements</a>
          </h6>
<p>
            All of the stream parsers listed above require the type of the value
            to parse (the associated attribute) to implement a streaming operator
            conforming to the usual I/O streams conventions (where <code class="computeroutput"><span class="identifier">attribute_type</span></code> is the type of the value
            to recognize while parse):
          </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Istream</span><span class="special">&gt;</span>
<span class="identifier">Istream</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">&gt;&gt;</span> <span class="special">(</span><span class="identifier">Istream</span><span class="special">&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">attribute_type</span><span class="special">&amp;</span> <span class="identifier">attr</span><span class="special">)</span>
<span class="special">{</span>
    <span class="comment">// type specific input parsing</span>
    <span class="keyword">return</span> <span class="identifier">os</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
            This operator will be called by the stream parsers to gather the input
            for the attribute of type <code class="computeroutput"><span class="identifier">attribute_type</span></code>.
          </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              If the <code class="computeroutput"><span class="identifier">stream</span></code> parser
              is invoked inside a <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">match</span></code></a> (or <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">phrase_match</span></code></a>) stream manipulator
              the <code class="computeroutput"><span class="identifier">Istream</span></code> passed
              to the <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code>
              will have registered (imbued) the same standard locale instance as
              the stream the <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">match</span></code></a> (or <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">phrase_match</span></code></a>) manipulator
              has been used with. This ensures all facets registered (imbued) with
              the original I/O stream object are used during input parsing.
            </p></td></tr>
</table></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h8"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.attributes"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.attributes">Attributes</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Expression
                    </p>
                  </th>
<th>
                    <p>
                      Attribute
                    </p>
                  </th>
</tr></thead>
<tbody>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">stream</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code>
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">wstream</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">whold_any</span></code>
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special">&lt;</span><span class="identifier">Char</span><span class="special">,</span> <span class="identifier">Attrib</span><span class="special">&gt;()</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">Attrib</span></code>
                    </p>
                  </td>
</tr>
</tbody>
</table></div>
<div class="important"><table border="0" summary="Important">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../images/important.png"></td>
<th align="left">Important</th>
</tr>
<tr><td align="left" valign="top"><p>
              The attribute type <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code>
              exposed by some of the stream parsers is semantically and syntactically
              equivalent to the type implemented by <a href="../../../../../../../../libs/any/index.html" target="_top">Boost.Any</a>.
              It has been added to <span class="emphasis"><em>Spirit</em></span> as it has better performance
              and a smaller footprint than <a href="../../../../../../../../libs/any/index.html" target="_top">Boost.Any</a>.
            </p></td></tr>
</table></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h9"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.complexity"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.complexity">Complexity</a>
          </h6>
<div class="blockquote"><blockquote class="blockquote"><p>
              O(N), where N is the number of characters consumed by the stream parser
            </p></blockquote></div>
<h6>
<a name="spirit.qi.reference.stream.stream.h10"></a>
            <span class="phrase"><a name="spirit.qi.reference.stream.stream.example"></a></span><a class="link" href="stream.html#spirit.qi.reference.stream.stream.example">Example</a>
          </h6>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a>
              section.
            </p></td></tr>
</table></div>
<p>
            A class definition used in the examples:
          </p>
<p>
</p>
<pre class="programlisting"><span class="comment">// a simple complex number representation z = a + bi</span>
<span class="keyword">struct</span> <span class="identifier">complex</span>
<span class="special">{</span>
    <span class="identifier">complex</span> <span class="special">(</span><span class="keyword">double</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">0.0</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">0.0</span><span class="special">)</span>
      <span class="special">:</span> <span class="identifier">a</span><span class="special">(</span><span class="identifier">a</span><span class="special">),</span> <span class="identifier">b</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span>
    <span class="special">{}</span>

    <span class="keyword">double</span> <span class="identifier">a</span><span class="special">;</span>
    <span class="keyword">double</span> <span class="identifier">b</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
          </p>
<p>
</p>
<pre class="programlisting"><span class="comment">// define streaming operator for the type complex</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;</span>
<span class="keyword">operator</span><span class="special">&gt;&gt;</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">complex</span><span class="special">&amp;</span> <span class="identifier">z</span><span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">char</span> <span class="identifier">lbrace</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">,</span> <span class="identifier">comma</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">,</span> <span class="identifier">rbrace</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">;</span>
    <span class="identifier">is</span> <span class="special">&gt;&gt;</span> <span class="identifier">lbrace</span> <span class="special">&gt;&gt;</span> <span class="identifier">z</span><span class="special">.</span><span class="identifier">a</span> <span class="special">&gt;&gt;</span> <span class="identifier">comma</span> <span class="special">&gt;&gt;</span> <span class="identifier">z</span><span class="special">.</span><span class="identifier">b</span> <span class="special">&gt;&gt;</span> <span class="identifier">rbrace</span><span class="special">;</span>
    <span class="keyword">if</span> <span class="special">(</span><span class="identifier">lbrace</span> <span class="special">!=</span> <span class="char">'{'</span> <span class="special">||</span> <span class="identifier">comma</span> <span class="special">!=</span> <span class="char">','</span> <span class="special">||</span> <span class="identifier">rbrace</span> <span class="special">!=</span> <span class="char">'}'</span><span class="special">)</span>
        <span class="identifier">is</span><span class="special">.</span><span class="identifier">setstate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span><span class="special">);</span>
    <span class="keyword">return</span> <span class="identifier">is</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
          </p>
<p>
            Using declarations and variables:
          </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">stream</span><span class="special">;</span>
<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">stream_parser</span><span class="special">;</span>
</pre>
<p>
          </p>
<p>
            Parse a simple string using the operator&gt;&gt;(istream&amp;, std::string&amp;);
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span><span class="special">;</span>
<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"abc"</span><span class="special">,</span> <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">str</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">str</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>                  <span class="comment">// prints: abc</span>
</pre>
<p>
          </p>
<p>
            Parse our complex type using the operator&gt;&gt;(istream&amp;, complex&amp;);
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">complex</span> <span class="identifier">c</span><span class="special">;</span>
<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"{1.0,2.5}"</span><span class="special">,</span> <span class="identifier">stream_parser</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="identifier">complex</span><span class="special">&gt;(),</span> <span class="identifier">c</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">a</span> <span class="special">&lt;&lt;</span> <span class="string">","</span> <span class="special">&lt;&lt;</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">b</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>    <span class="comment">// prints: 1.0,2.5</span>
</pre>
<p>
          </p>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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